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H. F. KLINGELE Re. 21,582

AUTOMATIC MULTIPLE CRNK-PIN GRINDING MACHINE original Filed Feb. 24, 1930 11 Smets-sheer 1- sept 24, 1940.

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Sept. 24, 1940. H. F. KLINGELE R- 21.582

UTOHTIC UL'I'IPIJB (iRANK-PIN GRIN-DING MACHINE Original Filed Feb. 24. 1930V 11 Sheets-Sheet 2 SGPL 24, l940 H. F. KLINGr-:LE Re. 21,582

AUTOMATIC MULTIPLE CHANK-PIN GRIDING MACHINE Original Filed Feb.l 24, 1950 11 Sheets-Sheet 3 Sept. 24, 1940. F. KLINGELE `Ri 21,582

i AUTOMATIC MULTIPLE CRANK-PIN GRINDING MACHINE Original F'illad Feb. 2 4, 19.30 l1 Sheets-Sheet 4 sqil. 24, |940. V |=V KUNGELE Re. 21,582

AUTOMATIC MULTIPLE CRANK-PIN GRINDNG MACHINE Original Filed Feb. 24, 1930 1 1 Sheets-Sheet 5 Sept. 24. 1940. H. F. KLlNGELE AUTOMATIC MULTIPLE CRANK-PIN GRINDING MACHINE Original Filed Feb. 24, 1930 l1 Sheets-Sheet 6 Re. ll Sheetsusheet 7 H F. KLINGELE I J\\\\1 l Eg so www' vf 14 5r/EW.

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Sept. 24, 1940. H y: KUNGELE Re. 21,582

AUTOMATIC MULTIPLE CRANK-PIN GRNDING MACHINE Original Filed Feb.r 24, 1950 ll Sheets-.Sheet E3 569t- 24, 1940- H` F, KLINGELE Re. 21,582

AUTOMATIC MULTIPLE CRANK-PIN GRINDING MACHINE Original Filed Feb. 24, 1950 1l SheetsSheet 9 AUTOMATIC MULTIPLE ammi-PIN GRIN'DING MACHINE Sept. 24, 1940. H, KLINGELE 1l Sheets-Sheet 10 Original Filed Feb. 24, 1930 Sept. 24, 1940. H, F4 KLINGELE Re- 21,582

AUTOMATIC MULTIPLE CRNK-PIN GRINDING MACHINE original Filed Feb. 24, 1930 11 Sheets-Sheet il.

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UNITED STATES N1 `AT|51NT OFFICE seams sept 24, 1940 AUTOMATIC MULTIPLE CBANK-PIN GRINDING MACHINE Herman Kiingele, Worcester, Mass., -assignor Original No. 2,014,768, dated September 17, 1935,

Serial No. 430,513, Feb August 30, 1932.

ruary 24, 1930. Renewed Application for reissue August 14, 1936, Serial No. 96,125

58 Claims.

This invention relates to a machine for roughgrinding or nishfgrinding the crank-pins on crank-shafts for multiple cylinder engines.

'I'he principal objects of the invention are to provide a machine of thischaracter which -will grind the crank-pins to a uniform diameter, within the limits usually prescribed for this class of work, without handling the crank-shaft after it is put intothe machine or other outside interference: to provide means whereby the machine will grind all the crank-pins and then automatically stop when lthe last pin is ground; to provide a machine which will handle varying lengths of crank-shafts for diierent engines; to provide for driving the work, and operating the pump which supplies thel water used in wet grinding by a separate motor, this motor beingthe` one automatically stopped when the work is completed: to provide means for controlling the motion and location of the work table by the operator when inserting a new shaft or for experimental purposes, and to provide a construction on which the table, head stock and foot stock, when once set up with the crank-shaft, will be permanently iixed with respect to each other thereafter and in which the position thereof on the base is at all times under the control of the machine when working on a crank-shaft.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which: A

Fig. 1 is a front elevation of a complete machine embodying this invention in a form to iinish grind the crank-pins of a six-cylinder engine;

Fig. 2 is a part sectional view of the feed box on the line 2 2 of Fig. 1 and drawn on a larger scale, the cover shown in Fig. 1 being removed;

Fig. 3 is a sectional plan view on the line 3-3 ot Fig. l of the feed box and of the cam lever controlling it in part:

Fig. 4 is a plan of the complete machine;

Fig. 5 is a partial lelevation of the right hand end of the machine;

Fig. 6 is a part sectional elevation of the left hand end of the table;

Fig. 7 is a sectional elevation of the headstock:

Fig. 8 is an end view of the headstock showing the position of the pinion and intermediate pinion for transmission of motion to the footstock:

Fig. 9 is a section on the line 9-9 of Fig. 7 through the chuck, showing the method of securing the work in the chuck;

Fig. 10 is a section on the line II-II oi' Fig. 8 showing the pinion and intermediate pinion;

Fig. 1l is a section on a larger scale on the line II-II of Fig. 8 showing the giveway stop for the varying work;

'Fig'. l2 is a sectional elevation of the footstock;

Fig. 13 is an end elevation of the same;

Fig. 14 is a section on the line Il-Il of Fig. 13 showing the mounting of the intermediate pinion; I

Fig. 15 is a sectional elevation showing' the mounting of the worml worm wheel and wheel upon which the cams are mounted;

Fig. lfirisl a sectional view on the line IG-IG of Fig. 15 showing the friction drive between the worm and cam wheels;

Fig. 17 is a sectional elevation on the line I1-Il of Fig. 1 showing the hydraulic cylinder `that operates the table, the valve for the same position of the crankpins on the and the stop that automatically stops the tablel at either end of its total allowable travel.

Fig; 18 is a front view of the mechanism controlling the movement of the table, showing the table stop cam, part of the spacing bar and the lever controlling the valve that operates the table;

Fig. 19 is a section on the line I9-I9 of Fig. 18 through the hand lever;

Fig. 20 is a section on the line 2li-20 of Fig. 18 through the adjustable feature of the stop;

Fig. 2l is a section on the line 2|-2I of Fig. 18 showing the rolls on the stop and lever;

Fig. 22 isan end view of the valves and cams that control the angular position of the work;

Fig. 23 is a cross section of the hydraulic valve used for operating all cylinders except the one controlling the table;

Fig. 24 is a longitudinal section of the same;

Fig. 25 is a part sectional end elevation of the` machine, showing the quickand slow control of feed for the wheel slide, also thewheel drive;

Fig. 26 is a cross section through the center of the steadyrest;

Fig. 27 is a cross section on the line 21-21 of Fig. y26 of the steadyrest alone.

Fig. 28 is a front elevation of the steadyrest and the cam and lever controlling it;

Fig. 29 is a rear view of the truing bracket bolted to the wheel slide; Fig. 30 is a cross section of the truing bracket on the line 3l-30 of Fig. 29 showing the ratchet gear .and screw that moves the truer as much asA rhas been removed in truing.

Fig. 31 is an elevation of the wheel truing device; e I

Fig. 32 is a plan of the wheel truing device showing the parts only that are supported on the wheel slide; e

Fig. 33 is a cross section on the line 33-38 of Fig. 32:

mg. 34 is on enlarged portion of Fig. 33; ma

Fig. 35 is a rear sectional elevation showing the- Mounted on ways I4 on the base is a slidable n table `I5 carrying a head-stock II and a footstock I1. The head-stock is rigidly secured to the left hand end of the table. 'I'he foot-stock is adjustably but rigidly secured to the right hand end of the table. The three parts, table, headstock and foot-stock, for all practical purposes,

are in one piece when once set up for grinding a particular crank-shaft. The position of this unit on the base 'is at all times, under the control of the machine when working on a crank-shaft. The motion and location of the table can be controlled also rby the operator for the purpose of inserting a new shaft or for experimenting.

'I'he wheel slide 18 is carried by a wheel slide block I9 secured to one leg of the T-,shaped base. A, grinding wheel truing device and also the wheel guard 2i are secured to the wheel slide I8.

I have found it desirable to make a special machine for a crank-shaft with a given throw, and a ydifferent one for a crank-shaft having a different number of crank-pins. 'I'he machine shown is designed for a crank-shaft for a six-cylinder engine. Three motors 23, 24 and 25 are used to drive the machine. The motor 23 drives the grinding-wheel 26'. The motor 24 drives the pump 21 to provide` and maintain continuous hydraulic pressure. 4,These two motors run continuously under the control of the operator. The third motor 25 drives the work and also the pump 28 which supplies the water used in wet grinding, and controls several automatic features as will appear.

The motor 25 is started by the operator every time a new shaft is ready to' be ground and is automatically stopped when the grinding is completed for the whole shaft. 'I'his motor is shown as located on a shelf 28 at the rear of the left hand end of the base and belted directly to a pulley on the drum shaft 3l). From a drum 3i on this shaft a belt drives a pulleyV 32 on the spindle 44 of the head-stock. This belt has to travel laterally along the drum when the table is moved along. y

The motor 24 is located in an opening provided at the bottom of the left hand end of the base.

The motor 23 is shownas set up on the floor and belted directly to the pulley shaft 33 on the wheel slide. f

'I'he sequence of operation is as follows: The operator picks up a crank-shaft by means of an air hoist or other convenient lift and inserts the front end, that is, the one opposite the flanged end, in the chuck 34st 'the head-stock. The opposite end of the crank-shaft rests on a movable support 35 which brings it in line with the center. The foot-stock is moved hydraulically, as' will appear, so that the shaft is now on the two dead centers, and the exact location of the first crankpin has to be fixed beforethe shaft is secured in position. 'Ihe center of the steady-rest I3 coinoidos in moral position with the center or the grinding wheel.

By sliding a gauge over the end of the Jaw 48 of the steady-rest,l the slight movement of the table to b" ng the crank-pin shomders in position to nt the auge exactly, can be determined (see Fig. 26). The gauge is made the exact length of the crank-pins. The operator now knows that the crank-shaft is correctly located longitudinally and removes the gauge. The jaw 43 of the steady-rest is now made to assume a contact position on a correctly located pin and held there by another suitable gauge. The crankshaft is turned until this contact is obtained, and the rwork is secured by a clamping means controlled by a handle 31 and then a pinching handle 38 at the foot-stock isset. This latter handle is arranged to maintain pressure on the center independently of the hydraulic pressure.

During vthe finishing of the entire crank-shaft the mechanism makes one complete revolution. A complete set of cams is maintained for each sixth of the revolution to produce identical movements. Upon completing the grinding of a pin the feeding in of the grinding wheel stops. The wheel holds its position at the finished grinding point for a short whilefthen the steady-rest descends and the table moves back by hydraulic pressure simultaneously.

Then the table and work move longitudinally andl the work revolves simultaneously, if necessary, through an angle of 120. A yielding means is provided for locking the work in an indexed position. This yielding means consists of a rod 34a provided with a head 34h against which a spring 34e bears and normally forces the head radially inward into contact with the chuck carrying the work. This head has a V-shaped rib 34d which is adapted to engage a similarly shaped recess or notch in the chuck or work support 34 for holding the same in a predetermined indexed position. Thenthe steady-rest comes up against the work and the wheel-slide moves in up to the point where cutting begins. This is done by hydraulic pressure. The mechanical fine feed has already been thrown in, so grinding commences thereafter. The hydraulic feed forces the wheel slide in under the control of a screw 4Il as will appear. As the grinding proceeds, the steadyrest is being gradually elevated so that thel finished grinding position is reached at the same time by the grinding wheel. Then follows the slight holding position of the 'grinding wheel again, and the above operations are repeated over and over until the several pins are ground. The machine is stopped electrically by crank motion which will be described, by vworking the push-button release 4I of a ,stopping lever.

Every time the machine stops an adjustment is made automatically. allowing the wheel slide to advance one thousandth of an inch which represents the amount to be trued off onthe finishing operation before the next shaft is begun. Automatic means is also provided, as will appear, whereby the recessional movement of the wheel slide also starts the wheel truing device. The wheel is trued after nnishing every shaft to neutral position. There are two of each these. Y

'Ihe pipes 83 are adapted to deliver pressure to one end of each of the two cylinders 88 and 58 while the pipes 54 deliver to the other end of the same cylinders. In each ofthe cylinders, of course, there is a piston and the piston rods are provided with racks 5l and 58 respectively, each meshing with a pinion 58 or 68. ,These pinions are mounted on shafts provided with eccentrics 6| and 82. 'I'he eccentrics are mounted in bushings on a frame 88 which is adapted for the purpose of moving the shaft 5I longitudinally. This shaft is provide'd with two collars at its end which set into a box 64 carried by the frame 88 and secured in position by a cap 65 and bolts as shown in Fig. 6. y

It will be noticed that the distance between the centers of the eccentrics BI and 62 is the same as thedistance between the center of the eccentric 62 and the center of the shaft 5I. The eccentric 6I has a throw of twice the amplitude of the throw of the eccentric 82. Now it will be seen that if the cylinder 86 is supplied with oil under pressure on the right side to force the racl: 58 to the left, it will turn the pinion 68 and the eccentric B2 through a half rotation.

At this time the frame 83 is fulcrumed on the eccentric 6I. Therefore the shaft 5l will be moved axially of the eccentric 82. Ori the other hand if the cylinder 55 is .supplied with oil under pressure the frame 68 will now be able to oscillate about the eccentric 82 as a-center and the shaft 5I will be moved in one direction just as far as the throw of the eccentric 8|, that being twice the throw of the eccentric 82 the two motions of the shaft 5I will be equal. The first of these motions above described is for the purpose of turning the work 120 and the other for the PUI'POSe of turning it a second 120.

Now by reference to Fig. 7 it will be seen that the shaft 8l is provided with a spiral gear 81 working in a nut 88. This nut is shown in the form of a separate steel piece which is driven in to the spindle 44 of the head-stock and it is also pinned or otherwise fastened so as to constitute a part thereof. It is made separately only for the purpose of economy and this thread is only practically a thread in this spindle.

The movement of the shaft 8l longitudinally therefore causes it torevolve relative to the spindle 44 actuating the chuck 84 by pinion 88 in mesh with pinion 42 "thus ycarrying the work through the areas above mentioned for the purpose of turning the crank shaft to bring the next crank into grinding position. The end of the crank-shaft isreceiveddn a socket in the headstock spindle which has a center. 18 for receiving it and is held by the clamp controlled by the handle 81 as previously described. This, ofcourse, is oil' center, theamount necessary for the particular crank-sbafts being operated upon. This machine is designed to operate on a standard crank-shaft and there is no adjustment shown in the distance between the center of the center point 'I8 and the center of the headstock spindle 44. f f

At this time it might be noted that although this machine is designed for grindingy crankshafts it can be used for grinding their bearings or for ordinary grinding on centers and the headstock is provided with a tapering centering recess 1I to be used in such a case. 'I'he spindle y44. of course.andheadareoperatedbythepulley a distance equal to twice the throwf u keyed therese and run by the meter :s as

previously stated. Between grinding operations the work is indexed around by the operation of the valve 52 which is automatic and which will be described later. g

'I'he pipe 58 is also provided with a branch valve 'I2 delivering oil under pressure to either of two pipes 'I3 and I4 which control a cylinder I6 and its piston operating the foot-stock to draw it back when the work is to be taken out and move it up when it is put in, the operations being similar. Two lines along the branch of the pipe 58 operate through a valve 88, the main cylinder 8i which is connected by its piston rod 88| xed to the table I5 for operating the latter. This also is al1 arranged automatically as will appear. The pump 21 therefore operates the four cylinders 55, 56, 'I5 and 8|, also the wheel slide cylinder 38.

The headstock spindle is driven from the motor 25. 'I'he head stock spindle and the foot stock spindle are each provided with gears indicated atA 86. 'I'hese gears are of the same size. The gears 88 are connected respectively through intermediate gears with pinions 8l fixed to a longitudinal shaft 88. The rotation of the head stock will, therefore, impart rotation to the longitudinal shaft 88 and the rotation of this shaft 88 will impart rotation to the foot stock 85. This preserves the lineup of the two centers and insures 'I'he right hand end of the shaft 88 is hollow and splined or non-circular to receivela smaller shaft 88 adapted to slidably Illt in the hollow end and of course, to be turned positively by the shaft 88 whenever the work is in motion. 'I'he shaft 88 transmits its rotation through a shaft 88 and bevel gearing 8l to a longitudinal shaft 82 in two parts connected together by a clutch 88 operated by a handle 84. When the two parts of the shaft 82 are clutched together the mechanism in the feed box 85 the wheel slide as will appear.

By means of a worm 88 vrotation is transmitted from the shaft 82 to a worm gear 81 on a stud 88 (see Figures 15 and 1'6). This stud is shown as having a bearing at one end only in a bracket 88 secured to the frame I8 and as having an oil pocket |88 under the 8'I is not fixed to the to its bearing so as to -this wheel 8I stud but the stud is xed be stationary. I'he hub-of is provided with a split collar |82 in an enlargement |88 on the hub ofa cam wheel |81. "Therefore when the parts are in the position shown in Fig. 16 the worm wheel and cam wheel are ilxed stud and when the cam I 88 is released the worm provided in the present instance with four grooves" for receiving cams. In each ofthese grooves there of these cams aroundthe circumference, when the machine is setrupffora six cylinder crank In the groove i811 are camslll, Pig. 28, which control the steady rest. In the groove. |88 are cams H8 which operate and control the mainv cylinder by I means/of the space bar therefor, as-will appear. Inthe'groovelll arecamsll! for controlling the -operationofthetwocylinders 8l and I8 to worm.- 'I'he worm wheel The screw las'and eeeentrie m are mounted.

together to rotate on the` is operated for feeding desired speed ratio. l

change the angle of the crank shaft. In the side groove ||I are cams III which control the operation of the wheel slide.

The cams I il engage and operate an arm of a lever H5. This lever is connected by a link ||5 and three armed lever ||1 with the parts to be operated. One of these arms reciprocates a rod |I5 which extends to the right in Figs. l, 2and3andinitsreciprocationsoperatesapalr of dogs ||9 and |25 for controlling the connection of the shaft 52 with the wheel slide.

The shaft 52 is provided with a pair of opposite bevel gears 22 adapted to operate a bevel gear |25 in either direction. Connected with this latter bevel gear is a gear |25 driving a gear |25 on a stud carrying another gear |25 which meshes with a gear |21 that is in mesh with a gear |25. n the outside of the fine feed control of the wheel slide. the stud carrying the gears |25 and |25 is adjustable by being mounted on e.V swinging arm |25 having a slot connection |25 so that these gears |25 and |25 can be exchanged for gears of different sizes toget any The control of the connection of the shaft 52 with the gear |22 is provided through a yoke |52 entering a' clutch collar |22 for clutching either oneof the gears |22 to the shaft 52 or free both o f them. This is a spring controlled yoke having springs III opposing each other and a collar |35 operated by a tooth |35, as will appear.

This tooth is mounted on a lever |51 which exy tends beyond its pivot and'csn be operated by hand in the preliminary process of setting up the machine. A lever carries the two dogs and |25, which are adjustable for obvious purposes. and the link Ill is provided with an elongated slot |28 to give a little play in` connection with its operation with one of these dogs.

The lever |21 is pivoted at I on the frame. 'lhe yoke structure |52 is provided with collars ill on the two ends which constitute stop surfaces and a pair of latches |45 are provided having abrupt transverse surfaces l adapted to come behind these collars III which, when either one of them 2 c a little way inwardly from the position shown in Fig. 2. prevents further motion backwardly. lhese latches are released by the motion of the lever- |21 about its pivot operating cam surfaces on their ends. l

vllt will be seen therefore that when the link v||2 is moved over far enoudi to take the dog ||5 backwardly it swings the lever |31 to the right below its pivot. When it is moved in the oppositedirectionitwillswingthisleverinthe opposite direction. These .two dogs lil and are adapted to be'actuated by cams |45 and |41 y on the hand wheel Ill on which the gear |25 is mounted. This hand wheel is mounted to turn ontheaxisoftheshaftcarryingthe screw but is mounted on ashaft |55 set into the holries, keyed te 1t, s. gear lll wmen meshes with low end of the screw shaft. The shaft |55 cara pinion |52 fixed with respect to a pinion |55. These two pinions aremounted on a stud Illa looly'and this stud iscarried by the hand wheel Ill. Thel two pinions are of about the same sine but have different numbers of teeth. one having several teeth-more thanthe other.

The' pinion |52.- meshes with a circular rack l|5417 which, by means of bolts |55b. is fixed to the frame' Il of the machine and therefore is stationary. The result of this construction is that the rotation of the gear |25 is transmitted to the shafty|5l at a very low rate offspeed and from that shaft to the screw lli as the shaft |554 is keyed to the shaft of that screw. The gear |28, in the form shown, makes one complete revolution to .0606'of a revolution of the shaft |50. This gives .022" travel to the wheel slide. Thus the feed of the wheel slide I8 is provided for, both automatically and by hand, as the hand wheel |45 is provided with a handle |51 for adiu'sting the parts in setting up the machine. The wheel slide I5 has a downwardly extending bracket towhich is pivoted the end of the piston rod of the cylinder 35. The screw is completely tted to the bearing, which is split on the horizontal plane, the lower half being hinged on one side and bolted rmly in place on the other (see Fig. In this way'there will be no tendency to lift the wheel slide. or press the screw down, as is the case when a half nut is used with anything but a square thread. By simply releasing the bolt, the cap will hang down and the wheel slide can be bodily raised or lowered into place.

As the two cams M5 and |41 come around andll operates the dog |2|I with the lever on which both are mounted, the feed is stopped, being thrown into neutral, the position shown in Fig. 2, where it remains until the wheel slide starts to recede. the'three armed lever ||1 acts, and the short arm by the link ||5 will pull the lever controlling feed gear into reverse. 'Ihe feed gear is now reversing while the other changes are taking place, and it will so continue until the cam |41 'adjustably fastened to the -side of the stop feed cam just described, throws it out of gear into neutral. Then when the wheel slide .is again brought forward, the three' armed lever this time acting inthe opposite direction will throw the gear into feed, and ne feeding will be well on its way before the feed screw comes up against the shoulder |5| Obviously the setting of these two dogs and especially the setting of the two cams |45 and |61 will control the time of the start of the fine feed of the wheel slide and the time of its stoppage and reverse. After reversal of course the wheel slide comes to a stop. The rotation ofthe shaft |55 acts to bring the end ofthe screw shaft 4l firmly up against a shoulder |5||, a ball bearing thrust collar being located between them. At this point the grinding wheel just clears the work. It is brought to this position by the cylinder 35, the action of which is stopped at this point by the cam lil and at once opened up again automatically to create full pressure tending to move the wheel slide forward. Just a little before this the ne feed starts automatically.

The feed wheel |45 carrying the handle is mounted with a rlmning t on the shaft |55. The end of the shaft |55 is keyed so that the screw may always be driven by this shaft.

As the grinding wheel gets smaller after every truing operation, the position of the shoulder |5|| is brought nearer the front of the machine for a distance exactly equal to the amount removed in truing. 'Ihis is done by operating 'on a ratchet gear |54 as the correct position is on the horlzontal plane. The gear |54 is connected to the outer end of the shaft |55. On the inner end of this shaft is a gear |55 which meshes with a gear |51 formed as an integral part ofthe sleeve |55 having a thread cooperating with a threaded nut |55. Every tooth taken up by the ratchet permits the-slide to move .001 inch nearer the front and the wheel. As the shafts come to this machine from a similar machine doing the rough grinding the pins would all be .025" or .030" large. 'I'his being so, it would only require about seven tenths of a revolution of the hand wheel |40 to advance lthe slide sufliclently to attain the finish diameter.

The next operation, it will be understood, is the shifting of the crank shaft through at an angle of 120 or whatever is necessary for the particular crank shaft and these six operations just described take place over again.

When the three-armed lever ||1 is moved lnwardly at its outer or longer end it operates a link |51| which is adjustable by a turn buckle. This link operates a valve |I58 which controls the admission of oil under pressure to the cylinder 39 at either end and applies hydraulic pressure to the wheel slide. The object of this, as has been stated, is to operate the wheel slide by hydraulic pressure but to control it by the screw 40.

It may be stated at this point that on the cam' wheel |01 there is one cam |60 which acts as a stop cam to stop the machine after a complete cycle of operations for the purpose of finishing all the cranks on the crank shaft. 'I'his operates a lever |6| when the time comes. On this lever there is an arm |62 which, when the cam operates. the lever opens an electric contact 4| in the circuit of the motor 25 and stops the motor.

At the same time the lever |6| actuates an arm |60 which has a tooth |61 thereon for engaging the ratchet wheel |54 and turning it one tooth every time the machine is stopped. This, through the gearing |56 and ||'51 described above, advances the wheel slide a very small distance, as for example, one thousandth of an inch, after each complete series o'f operations. 'I'his is for bar is urged to the left in Fig. 18 by the .cylinder 8| and avroll |1| on a stop lever A|12 is located in one of the notches |10, stopping the bar and table for the time being. When one of the cams on the cam wheel |01 engages the nose |13 of the stop lever |12 it pushes down the r'oll |1'| out of its notch.

The upper horizontal arm of thebell-crank |12 -is made in two parts, and adjustably connected together by a double screw |14 operated by a worm and gear |15. vided with a hand wheel |16 by which it can be adjusted in length.

On the outer end of the bell-crank |12 is a projection |11. When the bell-crank comes down to bring the stud |1| out of the notch |10 this projection engages a roll |18 on an arm |19 free ona-\ shaft |00. A spring |0| holds this arm up in the position shown in Fig. f8, but of course yields to allow it to descend. p

Keyed on the shaft |00 is an arm'l90 having a latch |02 and a handle |83, the latch being forced downwardly bya spring |04 on the arm.

This arm |00 is connected by the latch with the;

The worm is on a shaft pro- '1 arm |19 which has a notch for that purpose. The arm |00.has the latch |02 operated by a lever |06 and`cooperating with the handle |03 for moving the latch outwardly by means of a roll |0|, the latch entering the notch in the end Aof the arm |19 and normally makes it move with `the arm |90.

. `When the ltime comes to advance the table for the purpose of grinding the next pin, the cam ||0.throws out the stop lever |12 which in turn swings the shaft |80 and the arm |90, which is connected with the arm |19 by the spring latch |02, so they both move. Thus the shaft |80 is turned, and by means of a crank |81, secured on its end inside the base of the machine, and a link |08, opens the valve 80 connected with the cylinder 0| which operates the table. For all of the pins the valve is opened and closed to move the table to the left only. The valve remains open until the roll |1| slides into the next seat in the spacing bar. Then the valve closes.

It will Abe understood that these seats or notches are spaced at distances exactly equal to the spaces between the centers of the crank pins on the work. 'Ihe length, from the end of the shaft being worked on, to the center of the first pin is usually standardized, but the location of the pin longitudinally on the machine varies slightly on account, of .the shaft being hung on the centers and the depths ofthe center countersinks lacking uniformity.

After all the pins are ground and the machine is stopped automatically by the stop cam |60, it is necessary to move the table the whole distance to the right so as to be in position for grinding the first pin on a new piece of work. By grasping the handles |83 and |86 and lifting the latch |82 the arm |90 is freed from the arm |19 and the operator can move the .table at will in either .direction without moving up the lever |12. As the handle is moved to the right for the purpose of moving the table to the right it contacts with a knee lever |89 and depresses the lever |19 that lifts the Stop bar |12. This allows the stop bar to drop and prevents its bounding in and out of the notches as the spacing bar passes until the table is stopped. Then the roll |1| is allowed to move into the first notch of the spacing bar.

It may be stated here that only five of the cams ||0 are required, spaced 60 apart and 60 from the stop cam |60. The last cam ||0 is not neededY because of the stop cam |60 which stops the table and machine as above explained after the last pin is ground.

The steadyrest 36 is bolted to the base of the machine in transverse alignment with the center of the grinding wheel and it has sliding contact with the table so that the table can movewithout moving the steadyrest. The cams |08 on the cam wheel |01 operate a lever |9|. This `lever is arrangedto operate anl adjustable rod |92, bell crank |03, links |94 and arms |05 on a shaft |96. On this shaft is an arm |91 having a roll |98 which engages a plate |99 on the back of the steadyrest proper 200.

When the arm is moved in one way it will push the roller down and allow theA steadyrest to descend `on an arc about a pin 20|. In Figs. 26 and 28 the position at the start of grinding is shown in vfull lines. As the grinding process proceeds the cam advances gradually, until the high point is reached, that is, when the grinding is finished. ANow a slight dwell on the cam comes into action on the lever |31, and continuing the cam depresses the lever, thus allowing the steadyrest to move down out of the way to permit the work to pass without interference. The steadyrest cams like the other cams on the -wheel l|l1 are spaced 60 apart. Thus the steadybeen stated herein that the wheel slide is ad-A vanced one thousandth of an inchfafter all the crankpins of each shaft have Ybeen trued. 0f course, it is not essential that this be one thousandth of an inch but that has been adopted as being a convenient amount.

In order that each shaft. shall be started with the stone 'in a position to grind thev crankpins of the sameV size on all shafts, I provide the truing device arranged to remove one thousandth of an inch from the stone after each shaft is completed. By that I mean that'ther stone is trued down to a total reduction of one thousandth of an inch after the several grindving operations are performed on a single shaft.

0f course, something is removed in the grinding and the truing device removes the remainder of one thousandth of an inch, if that is the amount decided upon.

For that reason/,the wheel slide can be moved up exactly the right amount after each shaft has been completed. It has been customary to true the stone after three shafts are completed,

that is, after eighteen grinding operations on a six cylinder shaft and it has also been. customary 'to apply the truing device to the grinding machine at that time and then remove it before the next shaft is put in and ground. In this case the truing device remains on the machine all the time and preferably is brought into jop/ eration automatically to true the stone after six grinding operations, if it is a six-cylinder shaft that is being operated upon. In this way vabsolute accuracy is obtained and there is not a great deal for the truing device to do. vli'urthermore, this truing device operates to true the two corners of the stone and the face of it during a single operation and while the work is being removed and replaced so that it does not take up any time that could be saved in any way.

'I'his truing device acts to true the corners of the wheel to the exact radius called for by the nllets of the crank-pins and 'it is readily adjustable so that whatever radius these fillets have can be taken care of by this truing device without anything but a very simple adjustment. It is also adjustable in a very simple manner to take care of crank-pins of different lengths and consequently stones of different widths. It can easily be adapted to true the wheel to greater or lesser amounts and with greater or less frequency than has been mentioned.

0f course, the wheel being trued up grows smallerand automatically the truing device is moved up to provide for this and can convenient-V ly have a range on an ordinary size machine of two inches so that a wheel can be reduced iour inches in diameter automatically and without adjustment except that obtained automatically. Then a new wheel has to be put in.

'I'he truing device is mounted on the wheel slide I3 to move with it. The base frame 241 of the truing device is bolted to the wheel slide i6 and supports a flat shoe or slide 246, provided .233, 244 and 244 to provide clearance between oil under pressure at its two ends by pipes 2I| which are joined to allow for the adjustment. The supply of oil is controlled from a valve 2I2 which is adapted t'o be operated to introduce oil under pressure to the two ends alternately. Every time` the wheel slide I6 moves back, a ratchet pawl 2i3 engages atooth of a ratchet wheel 2I4 mounted on a shaft.2 I 5. 0n this shaft is another wheel 2I6 having notches and a lever 2|3 has a roll 2I9and 'is pressed by a vspring 2 26 against the wheel 2|6. Thus. after Seach opera'- tion of the wheel slide. the wheel 2|5 and consequently the shaft 2I5 is held in xed position. When the wheel slide is operated six times, in the present case, a cam 22| ilxed on the wheel 2I6 engages 4the end of a lever 222 and oscillates that lever. This has two effects. In the rst place this is a three arm lever and connected with one arm is a link 223 which operates the valve 2I2 and allows oil under pressure to enter the cylinder 210 at one side to operate the piston therein. v

Another arm of the lever is connected by a link 224, which is adjustable by means of a turnbuckle 225, and swings a bell crank 226. This bellfcrank constitutes a stop against a plate 221 which is movable with the piston rod 228 of the cylinder 2 I3. At this time it moves the stop so that this plate will engage it -towards the end` of the stroke when the cylinder operates.

Movable with the cam 22| is another cam 235 one step ahead of it. 'Ihis cam operates a lever 23| similar to one arm of the lever 222. One arm of this lever is connected by a link 232 with a plate 233. This plate is moved up by this cam so as to come into contact with the end of a plunger 234 which is pressed down by'a spring 4and pressed up by this plate to cause a spring pawl 235 to engage a ratchet wheel 236 and ad vance it the distance of one tooth. 'This ratchet wheel is fixed on a shaft 231 provided with a screw thread 233 operating in a nut 239 constitutlng a `part of the frame of the truing device. The frame is advanced one thousandth of an inch, in the present instance. for each operation .The piston rod 22| o: the cylinder m 'u provided with a parallel rack movable with it and -meshing with the pinion or gear 252. 'I'he parts are so designed that the double travel of the piston in the cylinder 2li! will result in a.

half revolution of the gear 2 52 back and forth.

This gear is fixed on a stud 253 which carries an arm 254 having a forked end. 'I'he forked end of this arm engages a. block or diamond holder 255 which is mounted to slide in a quadrant path formed in one of the path castings .250. These two castings are bolted on the shoe 245 and, being made in two pieces, they can be adjusted and bolted the right distance apart. 'Ihe curved part of each casting is provided with a grooved T-slot to receive the diamond holder 255. The center of the slot has a radius centered about which the corner of the grinding wheel is described. On each inner end the two path castings are planed to iit the sliding block 258.

As the arm 254 turns and takes the block 255 with it through anV angle of 90 on the path casting 25|), at the bottom of Fig. 32, it then comes to the straight part of the path casting. Now it moves in this straight path and is guided by a sliding block 258 after completing its curved path. Then it moves along a straight path into the other casting 25|) and finally through the quarter circle at the end of thatcasting.

This arrangement is provided so that the diamond point dressing the wheel willv dress oi the corners. Thetwo arcs of the path castings 250 provide for the dressing of a wheel on a quarter circle and the diamond point is arranged at a proper distance from the center 253 to provide the desired curvature. 'I'he two castings are placed far enough apart so that'the straight part of the block 255 will just provide for truing the grinding wheel throughout its face.

It will be noticed that on the block 258 is pivoted a dog 250 at each side and in the path castings 25|) there are grooves 25| having a certain extent. When the diamond holder moves into engagement with the block 258 after completing its curved path, the dog 250 on one side having dropped into a groove' 25|, Fig. 34, at the end of the straight path, it engages the dog 250 at the other end and then the block 258 and the diamond holder move along in a straight line to the end of the straight path. "'At that point vthe dog in action drops down and the diamond holder will continue to move in a diiierent path, namely in the curved path of the other path castingy 250. 'I'he block 258, yremaining in the position in which it is left, is held in place by a give-way plug 252 located one at each end of the'straight path in which it moves.

It will be understood that this series of operations results in moving rthe diamond point around the cornerv of a stone through an angle of 90 while truing and then across' the stone and around the opposite corner 90. When the piston 225 moves in, the dog 221, attached to the underside of the rack, contacts with the lever 225 thus reversing the valve 2I2 and causing the piston to reverse. This brings the diamond back to its original position as shown in Fig. 32.

It -wili be seen therefore that the diamond travels a complete truing distance once and back during each operation. The amount of feed of hydraulic iiuid can be regulated` by the valve Aso as to flow for a quick or slow speed of the diamond. Ample time may be given to secure the best results, as the truing operation occurs while the machine is at a standstill for loading and unloading purposes.

It will be seen that all the advantages above described are secured by this machine.

Although I have illustratedand described only one form of the invention I am aware of the fact that modifications can be made therein by any person skilled in the art Without departing from the scope of the invention as expressed in the claims. Therefore, I do not wish to be limited in this respect but what I do claim is:

1. In a machine for grinding the crank-pins of crank-shafts, the combination of a table for supporting the crank-shaft to be ground, a grinding wheel, means for constantly rotating the grinding wheel, and means for indexing the crank-shaft around for bringing the different crank-pins in position for grinding, of a cyl- V inder and piston connected with the table for moving it lengthwise, pistons and cylinders connected for indexing the crank-shaft around, a pump and means connected with said pump for supplying the cylinders with liquid under pressure to move the pistons therein for the purposes described.

2. In a grinding machine, the combination of a table for supporting the article to be ground, a grinding wheel, means for constantly rotating the grinding wheel, and means for indeiging the crank-shaft around for bringing the different crank-pins in position for grinding, of a cylinder and piston connected with the table for moving it lengthwise, a grinding wheel slide; a piston and cylinder for operating the grindingwheel slide toward and fromthe work, pistons and cylinders connected for indexing the crank-shaft around, an oil pump and means connected with said oil pump for supplying the several cylinders with oil under pressure to move the pistons therein for the purposes described.

3. In a machine for grinding the pins of crankshafts, the combination with a reciprocable table,

of a head-stock and foot-stock thereon for supporting and turning the work, aspacing bar carried by said table having aseries of seats therein arranged at suitable distances apart to control the operation of the table, a cam wheel, a series.

of earns thereon, one for each angle between two crank-pins, and a lever having one arm in position to be engaged by said cams and having means on the other end adapted to engage in said seats to stop and hold the spacing bar and also the table.

4. In a grinding machine, the combination with a table having means for supporting the work to be ground, a grinding wheel, a spacing bar adapted to be xed with respect to the' .table and having seats therein, a lever having a roll for entering said seats and stopping the table and holding it in fixed position, one arm of said lever having a double screw and aw crm-wheel thereon, and a hand-wheel having a worm for operating the worm-wheel and adjusting the length of the arm of the lever.

5. In a grinding machine, the combination with.

arrn of the lever and moving the roll out o its seat, a cylinder having a pistonconnected ith said table for operating it, means for introducing liquid into said cylinder for moving theltable forward to bring the spacing bar into position for cooperation with the roll from one seat to the next, and means whereby when the roll is brought out of its seat the application of fluid to said cylinder will be turned on.

6. In a grinding machine, the combination with a table for supporting the work to be ground and a spacing bar carried by said table and having seats therein at desired intervals, of a cam actu` ated lever having a roll for entering said seats, one at a time, and stopping the bar and table, a pivoted arm adapted to engage the end of said lever and to be pushed away by it when the roll is moved out of its seat, a cylinder having a piston connected for operating the table, means normally connected with said arm for allowing liquid underpressure to enter said cylinder on the side to move the table forward when the roll moves out of its seat, a hand-lever adapted to be moved back and to operate said connections for introducing liquid on the other side of the piston in the cylinder to move the table back, a

latch connection between the hand-lever and thel arm, manual means for releasing the latch when the table is to be moved back, and means operated by the hand-lever for forcing the arm away from the `first-named lever to prevent said arm forcing the roll back into the seats in the spacing bar as the table ismoved back.

7. In a grinding machine, the combination with a table having mea-ns for supporting the Work to be ground, a grinding wheel, a spacing bar adapted to beiixed with respect to the table and having seats therein, a lever having a roll for entering said seats and stopping the table and holding it in fixed position, a hand lever having a connection by which it is adapted to reverse the cylinder by operation of its valves when the hand-lever is turned in one direction, an arm pivoted on the same axis and fixed with respect to the hand-lever through which said roll operates the valves to stop the introduction of liquid into'the cylinder, and means operated by said hand-lever when actuated to move the cylinder back for bringing said arm out of the way,` whereby the roll will not be forced back into the several seats as they pass it when the table is movins back.

8. In a grinding machine, the combination with a table and a head-stock thereon having an eccentric center, of a central spindle adapted to move longitudinally, a spiral gear on said spindie, a nut tting said spiral gear, means for turning said nut to advance and retract the central spindle in an axial direction, and means carried by the central spindle for operating the eccentric center for indexing purposes;

9. In a grinding machine, the combination with a reciprocable table, a hydraulic cylinder for operating the table, mechanical means for stopping the table at intervals in its forward travel, means operated by said-mechanical means for shutting off the pressure from the cylinder, a

head-stock xed on the table, a foot-stock movably mounted on the table, a hydraulic cylinder adapted to operate the foot-stock center in an axial direction, means for supplying liquid under pressure to both of said cylinders, and a valve for controlling the admission of oil for each cylinder.

10. In a crank-shaft grinding machine, the combination with a table, head-stock and footstock for supporting the crank-shaft to be ground, each having a spindle, a grinding wheel and means for indexing the crank-shaft around from one crank-pin to the next comprising a pair of hydraulic cylinders, means for supplying oil under pressure to the cylinders to advance their pistons in either direction, a lever, means connected with said lever for turning the crankshaft a portion of a revolution, racks connected with the pistons of said cylinders, gears or pinions operated by said racks, and shafts on the lever on which said gears or pinions are mounted, said lever having passa-ges therethrough for receiving said shafts and also having a shaft connected with the headstock, means whereby the movement of the shaft longitudinally will rotate the head-stock spindle, said lever having a bearing for said shaft, the distance from the center of said shaft to the center of the shaft of one of said gears being equal to the distance between the shafts of the two gears, whereby when the most remote cylinder is not working and the second cylinder is working, the head-stock shaft will be moved a distance equal to twice the stroke. of the piston of the intermediate cylinder and when the second or intermediate cylinder is not working and the more remote cylinder is working, the head-stock shaft will be moved a distance equal to the stroke of the more remote cylinder.

l1. In a crank-shaft grinding machine, "the combination with a table, head-stock and footstock for supporting the cra-nk-shaft to be ground, each having a spindle, a grinding wheel and means for indexing the crank-shaft around from one crank-pin to the next comprising a pair of hydraulic cylinders, means for supplying oil under pressure to the cylinders to advance their pistons in either direction, a lever, means connected with said lever for turning the crankshaft a'portlon of a revolution, racks connected with the pistons of said cylinders, gears or pinions operated by said racks, shafts on which said gears .or pinions are mounted, said lever having passages therethrough for receiving said shafts, a shaft connected with the head-stock having a spiral gear thereon, the head-stock having a spiral nut xed thereto meshing with the gear, whereby the movement of the shaft longitudinally will rotate the head-stock spindle, said 1ever having a bearing for said shaft, thedistance from the center of said shaft to the center of the shaft of one of said gears being equal to the distance between the shafts of the two gears, the spiral gear being so arranged that when the intermediate cylinder operates, the crank-shaft will be turned one hundred twenty degrees, whereby when the more'remote cylinder operates, the crank-shaft will be turned through an arc of another one hundred twenty degrees.

12. In a grinding machine, the combination lwith means for supporting the work to be ground,

means for rotating it, a grinding wheel slide, a grinding wheel mounted on said slide, means `for rotating the grinding wheel constantly, a hydraulic cylinder connected with said grinding wheel slide and tending constantly to advance it toward the work, a screw also connected with said grinding wheel slide, and means for rotating said screw at a very slow rate of speed to control the action of said cylinder and feed the wheel toward the work at a controlled speed of a controlling device for the screw comprising a gear and a ratchet motion for operating said gear slowly, said gear having a shoulder against which the end of the screw bears when the grinding wheel is brought into position to touch the work.

13. In :a grinding machine, the combination with means for supporting the work to be ground, means for rotating it, a grinding wheel la hydraulic cylinder connected with said grind-` ing wheel slide and tending constantly to advance it toward the work, a screw also connected with said grinding wheel slide, and means for rotating'said screw at a very low rate of speed to control the action of said cylinder and feed the wheel toward the work at a controlled speed, of a controlling device for the screw comprisingl a rotary element, a,L differential therein, a shaft connected with said differential to rotate at a very slow speed, a sleeve-on said shaft having a gear thereon, and a ratchet motion for operating said gear slowly, said gear having a shoulderagainst which the end of the screw bears when the grinding wheel is brought into position to touch the work. v

14. In a grinding machine, the combination with a table and means for supporting the work,l means for rotating the work on the axis about which the grinding operation is to take place, a grinding wheel, a wheel slide on whichthe grinding wheel is mounted, a steady-rest for the work, means for operating the wheel slide, steady-rest and table, a cam wheel and a plurality of series of cams on said cam wheel arranged to control ,the respective operations of the steady-rest, table and wheel slide.

15. In a grinding machine, the combination with a table Aand means for supporting the work,

a grinding wheel, a wheel slide on which the grinding wheel is mounted, a steady-rest for the work, hydraulicV cylinders for operating the wheel slide and table, a cam wheel and a plurality of series vof cams on said cam wheel arranged to control the operation of the several hydraulic cylinders for operating the table and wheel slide, means for indexing the work around to bring one eccentric part o! it after another in position for grinding, said\means comprising two cylinders and connections whereby the operation oi said cylinders will turn the work on an axis eccentric to the cylinder being ground, and means for introducing fluid under pressure yinto the two cylinders in the desired order.

16. In a grinding machine, the combination with a table and means for supporting the work,

means for rotating the work on the axis about which the grinding operation is to take place, a

- grindinglwheel, a wheel slide on which the grindl- 'ing wheel is mounted, a steady-rest ior the work,

hydraulic cylinders for operating the wheel slide and table, a cam wheel and a plurality of series oi cams on said cam wheel arranged to control the operation of the several hydraulic cylinders for operating the table and wheel slide.

1'7. In a grinding machine, the combination with a table having means for supporting the work, a grinding wheel adapted to be rotated constantly, a wheel slide carrying the grinding wheel,

- a hydraulic cylinder for operating the wheel slide towardand from the work, means Afor controlling the feed oi the grinding wheel by the cylinder,` a hydraulic cylinder for opera-ting said table, means for controlling the latter hydraulic cylinder, .and means independently mounted on the machine for truing the' face and corners of the grinding wheel said last-namedl means being automatically operated when the wheel slide is drawn back a predetermined number of times.

18. In a grinding machine, the combination with a table having means for supporting the work, a grinding wheel adapted to be rotated, a

wheel slide carrying the grinding wheel, and

means independently mounted on the machine wheel every time the wheel slide is drawn back for the purpose of allowing the work to be removed and replaced, said means comprising a pair oi' plates each having an arcuate groove of about a quarter of a circle and a straight portion, said plates being mounted so that their straight portions are in alignment and being adjustable toward and from each other for diierent sized wheels, a truing element movable along said grooves through an arc of 180, thus providing for truing first one corner of the wheel and then moving it across the face and truing that and then truing the other corner, a. hydraulic cylinder, and means connected with said hydraulic cylinder for moving the truing tool thro-ugh the course described.

19. In a truing device for a grinding wheel, the combination of a pair of plates each having a cam groove curved on an are of substantially and a continuation thereof at one end tangent thereto, saidfplates being right and left handed and being placed with their tangents in align- `'ment and being adjustabletoward and from each other, a block located under said plates at the point where they come nearest together to bridge truing tool will ilrst true 0E one corner of the stone throughout a qua'rter circle and will then move across the face of the stone and true it and then true off the opposite corner to an. arc of 90. 20. In a truing device for a grinding wheel, the combination of apair of plates each having a groove therein, a truing device mounted to move in said grooves, the two plates being arranged right and left hand and spaced apart, a sliding block between them, means` for moving the truing tool along said grooves throughout an arc of to bring it` around the corner of the stone, across its face, and around the other corner, a pivoted dog on each side of the block, said plates having grooves for receiving said dogs shaped so that when the truing tool holder passes into the space between the plates it will engage one of said dogs and cause the block and tool holder to move as one in straight line to the end of the straightl path and so shaped that the dog drops down allowing the holder to continue to move along the curved pathof the other plate and the'sliding block to be stopped at the end of the straight path. 21. In a grinding machine, the combination with a wheel slide, means for moving thewheel operation, a -grinding wheel carried by the wheel slide, a ratchet wheel having a plurality of notches therein, a pawl on the whel slide for operatingsaid ratchet wheel at each reciprocation of the slide, a cam tooth carried with the ratcet wheel, a lever in position to be operated by e tooth at a predetermined time, a wheel truing device, a hydraulic cylinder, means controlled by said lever for allowing fluid under pressure to enter the hydraulic cylinder, means operated by the hydraulic cylinder for moving the truing tool to true oil the grinding wheel.

22. In a grinding machine, the combination with Aa wheel slide, means for moving the wheel slide back and forth to start and ilnish a grinding operation, a grinding wheel carried by the wheel 

